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i386/cpu: make -cpu host support monitor/mwait

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When guest CPU PM is enabled, and with -cpu host, expose the host CPU
MWAIT leaf in the CPUID so guest can make good PM decisions.

Note: the result is 100% CPU utilization reported by host as host
no longer knows that the CPU is halted.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20180622192148.178309-3-mst@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2018-06-22 22:22:05 +03:00 • committed by Paolo Bonzini
parent 6f131f13e6
commit 2266d44311
4 changed files with 43 additions and 10 deletions
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9
target/i386/cpu.h
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@ -1382,6 +1382,15 @@ struct X86CPU {
/* if true the CPUID code directly forward host cache leaves to the guest */
bool cache_info_passthrough;
/* if true the CPUID code directly forwards
* host monitor/mwait leaves to the guest */
struct {
uint32_t eax;
uint32_t ebx;
uint32_t ecx;
uint32_t edx;
} mwait;
/* Features that were filtered out because of missing host capabilities */
uint32_t filtered_features[FEATURE_WORDS];